Jenkins pipeline - get next cron execution time of a job

Jenkins.GetNextExecutionTime.txt

/*
Inspired by
https://github.com/jenkinsci/jenkins/blob/master/core/src/main/java/hudson/triggers/TimerTrigger.java#L107

Some approvals are required in Jenkins in order to execute the following sample
*/


import hudson.scheduler.CronTabList;
pipeline {
    agent any
    stages {
        stage('Set up environment') {
            steps {
                script {
                    def job = Jenkins.instance.getJob("A job has cron defined")
                    for(trigger in job.triggers.values()) {
                        println trigger.job.name
                        println trigger.spec
                        
                        CronTabList ctl = CronTabList.create(trigger.spec)
                        Calendar previous = ctl.previous()
                        Calendar next = ctl.next()
                        
                        println previous.getTime()
                        println next.getTime()
                    }
                }
            }
        }
    }
}